Offered here is the Nockturnal S 3pk Red nocks.
These nocks can go straight from the package to the shaft in fully operational condition. No prep work needed. Just insert it, and you are ready to shoot. Piston driven contact switch ensures L.E.D. illumination every time. Waterproof and shock resistant design is second to none. Shoot it at dusk, and with 20+ hours of battery life, you can still find your arrow the next day.